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Re: [Qemu-devel] [PATCH v2] pci-assign: Add MSI affinity support
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v2] pci-assign: Add MSI affinity support |
Date: |
Sun, 19 May 2013 17:00:11 +0300 |
On Mon, May 13, 2013 at 02:20:02PM -0600, Alex Williamson wrote:
> To support guest MSI affinity changes update the MSI message any time
> the guest writes to the address or data fields.
>
> Signed-off-by: Alex Williamson <address@hidden>
Seems the only way we can fix this for 1.5.
Acked-by: Michael S. Tsirkin <address@hidden>
> ---
>
> v2: Don't cache MSIMessage
>
> hw/i386/kvm/pci-assign.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/hw/i386/kvm/pci-assign.c b/hw/i386/kvm/pci-assign.c
> index c1e08ec..ff85590 100644
> --- a/hw/i386/kvm/pci-assign.c
> +++ b/hw/i386/kvm/pci-assign.c
> @@ -1026,6 +1026,21 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev)
> }
> }
>
> +static void assigned_dev_update_msi_msg(PCIDevice *pci_dev)
> +{
> + AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
> + uint8_t ctrl_byte = pci_get_byte(pci_dev->config + pci_dev->msi_cap +
> + PCI_MSI_FLAGS);
> +
> + if (assigned_dev->assigned_irq_type != ASSIGNED_IRQ_MSI ||
> + !(ctrl_byte & PCI_MSI_FLAGS_ENABLE)) {
> + return;
> + }
> +
> + kvm_irqchip_update_msi_route(kvm_state, assigned_dev->msi_virq[0],
> + msi_get_message(pci_dev, 0));
> +}
> +
> static bool assigned_dev_msix_masked(MSIXTableEntry *entry)
> {
> return (entry->ctrl & cpu_to_le32(0x1)) != 0;
> @@ -1201,6 +1216,9 @@ static void assigned_dev_pci_write_config(PCIDevice
> *pci_dev, uint32_t address,
> if (range_covers_byte(address, len,
> pci_dev->msi_cap + PCI_MSI_FLAGS)) {
> assigned_dev_update_msi(pci_dev);
> + } else if (ranges_overlap(address, len, /* 32bit MSI only */
> + pci_dev->msi_cap + PCI_MSI_ADDRESS_LO, 6))
> {
> + assigned_dev_update_msi_msg(pci_dev);
> }
> }
> if (assigned_dev->cap.available & ASSIGNED_DEVICE_CAP_MSIX) {